Exercises

The mean weight of players on a football team is 81 Kg. The weights are:

92, 88, 100, 76, 64, 92, 80, 80, 68, 64, 100, 96, 96, 64, 64, 68, 72, 96, 68, ? , where one number is missing. Find it.
The misssing value is Kg.